By now they they have closed out the majority of tips and have gone through all cell phone and computer evidence, I would think. They have analysed the 911 call. Most likely have interviewed several people. Does not sound like they suspect a coworker, so far. I really think the key to solving this is one or both of those cars. They are still out there, and have not been accounted for. As far as we know. They may even have a lead on one of them right now. In my opinion, it will be the vehicle and or a tip that will be the breakthrough in solving this crime. There are still tips coming in. Someone must know something. It's just a matter of time before they find the right lead. Jmo